Singer Barry Manilow has been diagnosed with lung cancer and will undergo surgery, he announced in a social-media post today.

The “Mandy” and “Copacabana” singer said he would undergo surgery to remove a cancerous spot on his left lung, and he postponed several concert dates.

US singer-songwriter Barry Manilow says he has been diagnosed with lung cancer, prompting him to pause his scheduled concerts while he undergoes...